Wheel-dresser



F. DAWSON.

WHEEL DRESSER.

APPLICATION FILED AUG-11, 1919.

INVENTOR.

Fred Dawson. 4

3 SHEETS-SHEET l- Patented Mar. 1, 1921.

ATTORNEY.

F; DAWSON.

WHEEL DRESSER.

APPLICATION FILED AUG-H, 1919.

\ 369,78. Patehted Mar-1,1921.

3 SHEETS-SHEET 2.

I 4 l i I 72 -4 I J 1 I 3 1 l I I I 6) 1 win m a i l ll llfllldl INVENTOR.

Ffeo/ Dawson A TTORNE Y.

F. DAWSON.

WHEEL DRESSER.

APPLICATION FILED AUG-H, 1919.

Patented Mar. 1, 1921.

3 SHEETSSHEET 3- A TTORN E Y.

UNITED STATES PATENT OFFICE.

FRED DAWSON, OF WATERTOWN, NEW YORK, ASSIGNOR TO' LAWRENCE & HILL, INC.,WATERTOWN, NEW YORK, A. CORPORATION OF NEW YORK.

WHEEL-DRESSER.

Original application filed May 16, 1919, Serial No. 297,680. Divided andthis application filed August I Specification of Letters Patent.

Patented Mar. 1, 1921.

11, 1919. Serial No. 316,597.

To all whom it may concern:-

' Be it known that I, FRED DAWSON, a citizen of the United States,residing at Watertown, in the county of J eilenson and State of NewYork, have invented certain new and I useful Improvements inWheel-Dressers, of

grinder and is operated in part by the power which actuates the grinder,and which is adjustable for dressing abrading wheels of dif-" ferentdiameters, either while the grinding operations are being effected, orduring the intervals in which the thread grinders are idle. And afurther object is to provide means for adjusting thev wheel dressingmechanism for truing-up abrading wheels while the latter are employedfor grinding either right or left hand threads.

I attain these objects by the means set forth in the detaileddescription which follows, and as illustrated by the accompany ingdrawings, in which--- t Figure 1 is a top-plan view of the completedevice; showing the same in the act of grinding the threads of a gage.

ig. 2 is a vertical longitudinal section, taken on line 2-2 of Fig. 1;showing the means for adjusting the grinder for grinding right and lefthand threads of different angles.

Fig. 3 is a front-side elevation; showing by full and dotted lines theoperation of the wheel dresser.

Fig. 4 is a front-end elevation of the com plete device; showing by fulland dotted lines the adjustable nature of the wheeldressing parts fordressing wheels of different diameters.

Fig. 5 is a horizontal section taken on line 5-5 of Fig. 3; showing theconstruction and means for adjusting the wheel dresser.

Fig. 6 is a reduced front side elevation of the combined device; showinga small wheel for grindin internal threads, and also showing the w eeldresser swung from well as right and left hand threads.

the operative to the release position for facilitating the grinding ofinternal threads without interference from saidparts.

Fig. 7 is a broken rear-end elevation; showing a scale by means of whichthe grinder is adjusted for'accurately' grinding threads .of differentangles; also showing one of the bearings for the main grinding shaft,and the method of lubricating the same.

In the drawings, the base of the combined device comprises concentriccylindrical parts 2 and 3, both of which are erforated centrally toreceive a bolt 4, which is provided with a flange '4 at its lower endfor attachment to the groove in the usual compound rest (not shown)commonly carried by lathes. The rear side of the base is extended andsplit, as at 2, and is provided with a bolt 3, by means of which thebolt 4.- is clamped and held from turning in the base. The bolt 4 isalso provided with a nut 4 for making the device rigid with its support.The front side of the base is provided with a horizontal cross bar 5.The part 5 is integral with the base .2 which adjustably supports thegrinding and wheel dressing mechanisms. v j

The body of the grinding mechanism comprises an elongated portion 6which slidably bears against the bar 5 and is adjustably held j in placeby bolts 7, which pass through slots 6' in the opposite ends of the part6, and are threaded into the corresponding ends of the bar 5, the slots6' are arc-shaped and when bolts 7 areloosened up the wheel grindingmechanism may be tilted vertically, as shown by the full and dottedlines in Fig. 2,

for grinding threads of different angles, as

The rear end of the portion 6 is provided with a scale 8 representingdegrees which may be read in either direction from zero, the latterbeing shown in Fig. 7 to register with a single graduation 8' on thecorresponding end of the bar 5. When the grinding mechanism. is adjustedso as to bring zero above the graduation 8, the mechanism may beemployed for grinding right hand threads. When zero is moved downwardlyfrom the graduation 8 the device will then grind left hand threads. Thebody of the grinder ex-' tends forwardly from the portion 6 and isprovided with two similar arms 9 and. 9'

which are bored out axially to receive the main grinding shaft 10, thelatter being supported in split bearings 10" and 10, which preferablytaper in opposite dlrectlons, as shown by dotted lines in Figs. 1 and 3.Each of the bearings are split at their top sides and.

the shaft 10. The shaft 10 is driven by a sheave 13, which is made rigidto theshaft by means of screws 13, and the sheave is driven by a belt 13(shown in dotted lines in Figs. 1 and 3), which may be driven by theline shafting which drives the lathe. 14 represents a dust cap which isscrewed onto the arm 9 for protecting one end of the shaft 10, while 14represents a similar perforated cap through which the shaft 10 passesand which is screwed onto the arm 9. The shaft 10 projects beyond thecap 14 and is reduced and threaded, as at 10, to

receivethe threaded end 15 of the abrading wheel holder 15, whichsupports the abrading wheels 16 and 16, the former being shown in Fig. 1in the act of grinding the external threads 17 of a gage 17 The wheel 16is employed for grinding internal threads. In practice the gages aremounted between the head and tail centers 18 and 18' of a lathe and thegage is driven at a suitable speed and in the proper direction bywell-known connections with the head of the lathe. The grindingmechanism is preferably moved in the proper direction according towhether the threads are left hand or right hand, by the screw feedingmechanism of the lathe, which is well understood and does not needspecial description in the present case.

The wheel dressing mechanism comprises an arm 20, one end of which issplit and pivoted by means of a screw 20, to an upwardly projectingtongue 21, which is preferably 1nte ral with "the body 6 of the grinder.T e tongue 21 preferably fills the slot 20 of the arm and has a reducedportion 21' which is received in a downwardly facing groove 20 in thearm 20 which alines with the slot 20*. The arm 20 is held rigidly in theoperative position by a thumb-screw 22 which passes loosely through oneof several holes 22 in'the arm' 20, and is then threaded into thereduced portion of the tongue 21. The several holes 22' are provided forrigidly securing the dressing mechanism when adjusted to differentpositions longitudinally for positioning said mechanism directly overthe abrading wheels. At the same time the screw 20 may slanting screw20' clear of the belt 13 The opposite end of the arm 20 is provided withan enlarged rectangular head 23, which is cut away at 23' at its bottomend, to provide clearance for the grinding wheel 16. The

front face of head 23 is provided with a vertical dove tail groove 23 inwhich is slidablydisposed a similar tongue, of a reciprocable bed orpart 24 (see Fig.5), which supports the wheel dressing devices. The part24 is bored out longitudinally and threaded to receive an adjustingscrew 25 which is swiveled in a cap 23 of the head, the said screw beingprovided at its top end with a handknob 23, which is held in place by ascrew 23. The wheel dressers comprise similar pencil-like parts 26 and26, which are adjustably disposed in socket-holders 27 and 27, thelatter being mounted upon plates 28 and 28. The said plates are fittedwith dove-tail tongues 29and 29, which are slidably disposed in similargrooves 30 and 30' formed in blocks 31 and 31, the said blocks beingsuitably and rigidly secured to the bed 24 by screws 32. The blocks 31and 31' are mounted on the bed 24 at substantially 60 angles to thevertical center of the head 23 and the bed 24, and the dressing parts 26are positioned at right angles to the longitudinal axes of said blocksso that when said dressers are moved upwardly and downwardly theirpoints 26", which are preferably diamonds, travel in lines parallel tothe oppositely beveled grinding edges of the abrading wheels, fordressing said wheels.

The dressing pencils are recipro'cated in the blocks 31 and 31 by meansof rods 33 and 33 which are pivoted at one end of the plates 28 byscrews 33 The opposite ends of said rods are pivoted to a cross arm 34'of a lever 34 by a screw 33". The lever 34 is pivoted to the bed 24 by ascrew 34*. The rocking of lever 34 toward the right and toward the left,alternately moves the dressers 26 and 26 back and forth over the bevelcutting edges of the wheels 16 and 16',

ployed for grinding internal as well as external threads. (See parts 16and 16). The provision of the novel and simple adjustable wheel dresser,which is combined with the thread grinders and which may be operatedsimultaneously with the grinding mechanism, effects a great saving oftime because the wheels may be accurately and readily dressed withoutinterference with or from the grinding parts.

Obviously, some changes or modifications may be made in the parts of thedevice within the scope defined by the appended claims without departingfrom the spirit of my invention.

This application is filed as a division of my pending application,Serial No. 297,680, filed May 16th, 1919.

Having thus described my invention, what I claim, is-

1. The combination with a body, of a wheel dressing mechanism comprisingan arm pivoted to said body and having a head, a plurality of wheeldressers adjustably mounted on said head adapted to straddle an abradingwheel, means for adjusting said arm longitudinally, and a rocking leveradapted to alternately bring said dressers into operative contact withthe opposite sides of said abrading wheel.

2. The combination with a body,- of a wheel dressing mechanismcomprising an arm pivoted to said body and having a head, a bed movableon said head, a plurality of wheel dressers operatively mounted on saidbed, means for reciprocating said bed for moving said dressers towardand away from abrading wheels of different diameters, means for rotatingsaid arm and said head in a vertical plane and a rocking lever adaptedto alternately bring said dressers into operative contact with theopposite sides of said abrading wheels.

3. The combination with a base, of a body adjustably mounted on saidbase, a wheel dressing mechanism comprising a head having an armpivotally and adjustably mounted on said body, an adjusting screwcarried by said head, a bed slidable on said head and reciprocated bysaid screw, a pair of wheel dressers adjustably mounted on said bed, anda rocking lever pivoted to said bed adapted to alternately bring saidwheel dressers into engagement with the cutting surfaces of saidabrading wheel.

4. In a wheel dresser, the combination with a base, of a body adjustablysupported by said base, a wheel dressing mechanism comprising an armpivoted to said body and having a grooved head, aplurality of dressingpencils, a holder for each of said pencils, a bed for supporting saidholders, means for adjusting said holders for bringing said pencils intoposition for dressing abrading wheels of different diameters, and meansfor alternately bringing the points of said pencils into dressingcontact with the opposite cutting surfaces of said abrading wheels.

5.;A wheel dressing mechanism comprising an arm pivoted for movementtoward and away from an abrading wheel, in a vertical plane, a bedslidably mounted on said arm and movable in a vertical plane, a pair ofwheel dressers adjustably supported by said bed, and means foralternately bringing said dressers into abrading contact with theopposite edges of the abrading wheel.

6. The combination with a base, of a body tiltable on said base, a wheeldressing mechanism comprising an arm pivoted at one end to and tiltablewith said body, the opposite end of said arm having a head, the latterbeing cut away to receive an abrading wheel, wheel dressers adjustablymounted on said head and movable in a vertical plane, and a rockinglever for alternately moving said dressers toward and away from thecut-away portion of said head. i

7. The combination with a vertically movable body, of a wheel dressingmechanism comprising an arm pivoted at one end to said body and movabletherewith, the opposite end of said arm provided with a head which isslotted to' straddle an abrading wheel, a bed slidably mounted on saidhead and having a slot registering with the slot in said head, a pair ofwheel dressers supported by said bed at the opposite sides of said slotsand alternately movable toward and away from said slots, and a rockinglever for operating said dressers.

In testimony whereof I aflix my signature.

FRED DAWSON.

